| 成矿流体对德兴斑岩铜矿床中伊利石结晶度的控制作用 |
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| 引用本文： | 金章东,朱金初.成矿流体对德兴斑岩铜矿床中伊利石结晶度的控制作用[J].矿物岩石,1999,19(4):5-9. |
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| 作者姓名： | 金章东 朱金初 |
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| 作者单位： | 南京大学地球科学系,成矿作用国家重点实验室 |
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| 基金项目： | 国家自然科学基金!(编号49733120，49873026) |
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| 摘 要： | 伊利石广泛存在于铜厂大型斑岩铜矿床内，是特征的热液蚀变矿物，其结晶度和膨胀层含量受携带矿质的热液流体量控制。以浸染状强矿化为特征的斑岩体中上部及接触带附近伊利石结晶程度较好，主要是高水／岩比作用的结果。同时指示出伊利石结晶程度好的部位，矿化品位高，蚀变程度也强。
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| 关 键 词： | 成矿流体 铜矿床 斑岩铜矿 控矿 伊利石 结晶度 |
ROLE OF ORE-FORMING FLUID IN ILLITIC CRYSTALLINITY AT DEXING PORPHYRY COPPER DEPOSIT |
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| Jin Zhangdong,Zhu Jinchu,Ji Junfeng,Li Fuchun,Lu Xinwei.ROLE OF ORE-FORMING FLUID IN ILLITIC CRYSTALLINITY AT DEXING PORPHYRY COPPER DEPOSIT[J].Journal of Mineralogy and Petrology,1999,19(4):5-9. |
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| Authors: | Jin Zhangdong Zhu Jinchu Ji Junfeng Li Fuchun Lu Xinwei |
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| Institution: | Jin Zhangdong Zhu Jinchu Ji Junfeng Li Fuchun Lu Xinwei Department of Earth Sciences,State Key Laboratory for Research of Mineral Deposits,Nanjing University,Nanjing 210008 |
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| Abstract: | Illite is a kind of altered mineral within the hydrothermal alteration zone, including the altered granodiorite-porphyry and the altered metamorphic tuffaceous phyllitic near contact zone with porphyry rock body at Dexing porphyry copper deposit orefield. The illitic crystallinity value (IC) and expansibility are mainly affected by water/rock ratio or fluid influx. It was formed by illitization of plagioclase and micas during hydrothermal fluid evolution within the porphyry body and near contact zone with wall rocks. Moreover, the positive correlation between illitic index and copper grade indicates that, within the porphyry body and near contact zone with wall rocks, the higher the illitic crystallinity value is, the stronger the alteration degree is, and the higher the copper grade is. At lower portion of porphyry body, however, the illitic crystallinity vaule is mainly controlled by temperature and time. |
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| Keywords: | illite crystallinity ore forming fluid porphyry copper deposit |
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